I need some help proving several questions. I got really stuck at these and don't know where to begin. Other than that, these type of questions seem to come out often in my tests so I really need some help. Here we go;
1. n is a prime => n^2 + n + 1
2. The interior angle of a regular polygon with n sides is (2n-4)/n right angles.
3. Given that p and q are odd numbers p^2 + q^2 cannot be divisible by 4.
Thanks in advance. Explanation of steps would be nice but i can learn from step by step solution if needed.